Process.labelise now updates has_focus correctly, helping functions
updating has_focus flag before distinguishing two cases with/without focus + set up the
full positive phase
implem. of 1/2 negative part of the strategy
check that sk P = sk Q when labeling
minor (commentary)
helping functions in process.ml? for building a list of alternatives of focused process
(when starting a positive phase)
more comments and debugging stuff
[Done] last missing step of the compressed semantics: starting a positive phase
clean up process.mli
typo + more debugging stuff
minor
FIXED: when erasing a 0, set has_focus to false + minors