learningsimulator/learningsimulator: v1.2

This version addresses issue #178:

One may now export multiple expressions in a single export command (like in plot commands), where the expressions are separated by semicolon. Wildcards are also allowed in @{v,w,p,n}export, for example

@vexport s1->b1; s2->b2
@wexport s1; s2
@pexport s1[0.1],s2[0.2]->b1; s1[0.3],s2[0.4]->b2
@nexport s1->b1; s2->b2
@export v(s1->b1); p(s2->b2); n(s1->b1; s2->b2)

and

@vexport s1->*
@vexport *->*
@pexport s1[0.1],s2[0.2]->*
@wexport *