pager: exec pager using /bin/sh -c
This mimics the behavior of popen() and ensures setting the pager to something
like "LESS=FSRX less" will work.
hgweb: fix race in refreshing repo list (
issue2188)
record: check that we are not committing a merge before patch selection
It might sound like a good idea to use record to filter changes when merging.
If someone attemps this, it's better to tell her "no" right ahead, before the
patch generation/line selection, so she does not spend time doing it just to
receive a red light after that (sometimes rather long) process.