[RPL/2] RPL/2 4.1.11

[BERTRAND Joël]

	Hello,

	New RPL/2 release with some improvements and bugfixes:
- shared variables are now stored in a tree;
- lapack is upgraded to 3.4.2;
- only giac/src is built in rplcas (giac/Makefile.am is modified);
- gnuplot is upgraded to 4.6.1;
- giac, units and ncurses are upgraded;
- interprocess capabilities are removed when RPL/2 cannot run its 
initialization routine to keep operating system as clean as possible;
- sem_wait() has to catch EINTR in thread_surveillance_signaux();
- signal management is rewritten to avoid a strange bug on NetBSD. On 
NetBSD, a signal handler can be called within a special thread and not 
in the calling thread;
- static variables are now written in a variables tree;
- major bug is fixed in STO intrinsic. STO returns an error when it has
to create a global variable if intrinsic none (default) is set.

	Regards,

	JKB