Merge branch 'jh/p4-rcs-expansion-in-bytestring'

The RCS keyword substitution in "git p4" used to be done assuming that the contents are UTF-8 text, which can trigger decoding errors. We now treat the contents as a bytestring for robustness and correctness. * jh/p4-rcs-expansion-in-bytestring: git-p4: resolve RCS keywords in bytes not utf-8 git-p4: open temporary patch file for write only git-p4: add raw option to read_pipelines git-p4: pre-compile RCS keyword regexes git-p4: use with statements to close files after use in patchRCSKeywords