Add explanation of the idea of liquid branch
A few first strokes
Liquefication starts
First version of esrap-liquid, that passes at least some trivial tests
Make tests involving MATCH-START and MATCH-END working
Fix greedy repetitions of zero-length-matching rules
Add back CHARACTER-RANGES, test dynamic context wrapping.
Enable some context sensitivity tests. Fix STRING rule. Fix TIMES rule.
Towards temporary rules in PARSE
Make PARSE compile temporary top-level rule on the fly
Change name of system to ESRAP-LIQUID, add COPYING
Make all but one test enabled and working
Enable and correct the last test
Rewrite README, so it corresponds to new state of things