Rename ScilabJavaObjectBis.hxx for ScilabJavaObjectHelper.hxx
+ update the classes and declarations

Change-Id: I70184169a20b9c5a643c9e13c2fb9489cd7b91dd
Finalize the plug of jgetmethods

Change-Id: If4b69434a77dd32f2a63d2bf614a5e4da82d9043
jgetfields plugged

Change-Id: Idae1dbf9c63c7f5f18987ec6d3663b7308f0ecde
Add jcompile (looks like working), jgetfield (working) and jnewInstance (crashes)

Change-Id: I71c5996d8e2aa7ff61213718bd60348a8b6155c6