In the variable statement changed the name "curstate" to "cs" (the default

In the variable statement changed the name "curstate" to "cs" (the default
name used for the current state) and implemented the other names as their
defaults. Now all variables (p, pe, cs, top, stack, act, tokstart, tokend) can
be renamed.

git-svn-id: http://svn.complang.org/ragel/trunk@207 052ea7fc-9027-0410-9066-f65837a77df0