Commit Briefs
libventi: add functions vtsha1 and vtsha1check
These functions are equivalent to vtSha1 and vtSha1Check from the old libventi and are particularly used by Fossil. R=rsc http://codereview.appspot.com/5555064
libventi: add VtEntryNoArchive from liboventi, for use with fossil
R=rsc CC=plan9port.codebot http://codereview.appspot.com/5298088
libventi: add functions reconn and redial for use with fossil
R=rsc CC=plan9port.codebot http://codereview.appspot.com/5325046
venti.h: import indentation from plan 9
R=rsc CC=plan9port.codebot http://codereview.appspot.com/4571065
Fix a handful of small one-time memory leaks in vbackup,
and one per-package memory leak (in writethread).