revsetlang: add docstring with some tests to _quote

revsetlang: move quoting function to not be a closure I'm about to change the implementation here and I'd like to add some doctests, which means this needs to not be hidden inside another function.

revsetlang: portably bytestring-ify another pair of int() calls

checkcode: enforce lowercase for extension docstring title This will ensure new extensions are consistent and `hg help -e` has a consistent output. I have to add a new group since the normal "pypats" will be filtered by "pyfilters", which will remove comments and docstrings.

logtoprocess: use lowercase for docstring title

journal: use lowercase for docstring title See the previous patch for why.

automv: use lowercase for docstring title The first line of docstring is used in `hg help -e`. Use lowercase to be consistent with most extensions.

util: enable hardlink for some BSD-family filesystems Since we can now detect filesystems on FreeBSD and OSX. Add their major filesystems (ufs, zfs for FreeBSD; hfs for OSX) to the hardlink whitelist.

osutil: report fstype for BSD and OSX

setup: use a more strict way to test BSD or OSX's statfs We want to use the `f_fstypename` field to get the filesystem type. Test it directly. The new macro HAVE_BSD_STATFS implys the old HAVE_SYS_MOUNT_H and HAVE_SYS_PARAM_H. So the latter ones are removed.

debugfsinfo: use util.getfstype This changes the behavior slightly. It now always prints fstype, regardless of whether osutil.getfstype exists.

util: use util.getfstype

util: add a getfstype method The util version is a thin wrapper of the osutil version, which is not always available.

pager: fix the invocation of `more` on Windows After 9335dc6b2a9c, with 'shell' being (mostly) set to False, invoking `more` no longer worked. Instead, a warning was printed and the pager was disabled. Invoking `more.com` works. Since a user may have configured 'pager.pager=more', do this substitution at the end. Surprisingly, `more` does allow for arguments, so those are preserved. This also allows `more` to work in MSYS. Setting 'shell=False' runs the executable via CreateProcess(), which has rather wonky rules for resolving an executable without an extension [1]. Resolving to *.com is not among them. Since 'shell=True' yields a cryptic error for a bad $PAGER, and a *.exe program will work without specifying the extension, sticking with current 'shell=False' seems like the right thing to do. I don't think there are any other *.com pagers out there, so this one special case seems OK. If somebody wants to do something crazy that requires cmd.exe, I was able to get normal paged output with 'pager.pager="cmd.exe /c more"'. I assume you can replace `more` with *.bat, *.vbs or various other creatures listed in $PATHEXT. [1] https://msdn.microsoft.com/en-us/library/windows/desktop/ms682425(v=vs.85).aspx

help: format ``commands`` heading correctly The number of dashes under it needs to match exactly for it to be rendered as a heading. Without this change, the dashes end up on the same line as "commands", and "hg help config.commands" does not work.

convert: fix the handling of empty changlist descriptions in P4 Empty changelist descriptions are valid in Perforce. If we encounter one of them we are currently running into an IndexError. In case of empty commit messages set the commit message to **empty changelist description**, which follows Perforce terminology.