Remove variable output affected by length of TMPDIR. If the temporary directory is longer than /tmp then it's possible that the Subject line will get wrapped by the headencode function.

chunkbuffer: split big strings directly in chunkbuffer

localrepo.status: move fixup concatenation inside if block for clarity clean += fixup only makes sense if fixup is not empty; it should be inside the "if fixup" test.

chunkbuffer: targetsize isn't used outside of read()

chunkbuffer: use list instead of cStringIO

chunkbuffer: use for/else to detect end of iteration

changegroup*(): use enumerate when possible

changegroupsubset(): with the fix, prune() is actually useful in the testsuite

test-permissions: echo commands to make output readable

changegroupsubset: simplify knownheads/has_cl_set computation