If a Blackbox (BB) function modifies variable that is also used inside
of a non-blackbox function the following problem occurs: the variable
cannot be neither in the blackbox package neither in the normal
package.

We should try to resolve this problem by :
   (1) analysis wether variables are exclusively used by BB-fun
   (2) pass setter as additionnal argument to BB-functions

Still for now it is preferable to forbbids BB and globals.

* main.go, transform/checktype.go: Here.

* benchs/RERS/2016-Problem10.go,
benchs/RERS/2016-Problem11.go,
benchs/RERS/2016-Problem12.go,
benchs/RERS/2016-Problem14.go,
benchs/RERS/2016-Problem15.go,
benchs/RERS/2017-Problem10.go,
benchs/RERS/2017-Problem11.go,
benchs/RERS/2017-Problem12.go,
benchs/RERS/2017-Problem14.go,
benchs/RERS/2017-Problem15.go,
benchs/RERS/2018-Problem10.go,
benchs/RERS/2018-Problem11.go,
benchs/RERS/2019-Problem11.go,
benchs/RERS/2019-Problem12.go,
benchs/RERS/2019-Problem14.go,
benchs/RERS/2019-Problem15.go,
benchs/RERS/rers2go.sh,
benchs/run-benchmark.sh: Here.

Thanks to A. Martin for this patch

* transform/functiondefs.go: here.

* boilerplate/main.go, main.go: Here.

* main.go: Here.

In RERS challenges, file are written in C and
the environment is modelled by scanf("%d",...).

During the translation, this statement has been
converted into __RERS__ = __RERS__ + 1, since this
variable is only used to represents the environment.

As a consequence, the option -rers "1;2;3" will modify
the previous assignment in order to represent the
environment. In other this instruction will be replaced
by three assignment
   - __RERS__ = 1
   - __RERS__ = 2
   - __RERS__ = 3
while  the instruction __RERS__ = __RERS__ + 1 will be discarded

* boilerplate/main.go, main.go: Here.

* tools/blackbox.go: here.

* tools/blackbox.go: Here.

* tools/blackbox.go: here.

*  boilerplate/main.go: Here.

* tests/prod_cons_simp.go: Here.

* boilerplate/main.go,
  channel/channel.go,
  decl/decl.go,
  main.go,
  transform/afterchannels.go,
  transform/channels.go: Here.

* transform/channels.go: Here.

Removing useless pass for testing if array are used or not

* tests/passes/array.go,
  transform/checktype.go: Here.

In order to recover more easily where the channels are set up, a new
package has been created, giving details about it.

* boilerplate/main.go,
  channel/channel.go,
  decl/decl.go,
  main.go: Here.

Channels are now treated with all the other transform

* main.go,
  transform/channels.go: Here.

For a better translations and uses of channels, when they are used in
function calls, temporary variables are created.

* transform/channels.go: Here.

* transform/channels.go: Here.

Before, transform/channels.go used to convert only BinaryExpr, now all
expression are converted into array assignments.

* transform/channels.go: Here.

* transform/checktype.go: Here.

* transform/arraytreatment.go: Here.

* transform/arraytreatment.go: Here.

* transform/channels.go: Here.

This part need to be improved because, UnaryExpr can be used in
function call, assignment and other, for the moment, the status is only
updated, this part need to be focused on the successor gen.

* transform/channels.go: Here.

Merge branch 'am/goroutines-rebase' of https://gitlab.lrde.epita.fr/spot/go2pins into am/goroutines-rebase

* transform/channels.go: Here.

* boilerplate/Makefile: Here.

In order to facilitate channel transformation process, a new struct has
been created `chanInfo` :

```
type chanInfo struct {
    local, global string
    index         int
}
```

With this, we can easily find the original name of the channel if it is
different in the function. The index indicates where the function is
in the array of states and values.

* transform/channels.go: Here.

This patch provide a support for LTSmin
except for partial order reductions.

* boilerplate/go2pins.c,
boilerplate/go2pins.h,
boilerplate/main.go: here.

* transform/channels.go

* main.go: Here.

In order to be clearer, there is now only one alive statement for array
and no more alive statements for every cases of the array.

* main.go,
  transform/arraytreatment.go: Here.

* tests/array.go,
  transform/arraytreatment.go: Here.

* transform/channels.go: Here.

* transform/channels.go: Here.

* main.go: Here.

* main.go,
  transform/channels.go: Here.

* transform/channels.go: Here.

use `./go2pins -chaninfo <file>` to display channel information

* main.go,
  transform/channels.go: Here.