uniqtypes: some debug printing.
usedtypes: clean up multiple-match iteration code.
Trivial whitespace cleaup.
Use CIL plugins feature for dumpallocs etc; update allocscc accordingly, and factor common code into cilallocs.ml.
testes/simple-multi-alloc: make sure libglib gets included in the link.
Sensible behaviour for case where pointer value is -1.