pmlogger scripts - better locking between check and daily

Fix for http://oss.sgi.com/bugzilla/show_bug.cgi?id=979
iostat2pcp - timestamp rework

Fix for https://bugzilla.redhat.com/show_bug.cgi?id=981545 ... add
support for European datetime formats, and beef up documentation to
stress that not taking control of datetime format is dangerous.
pmlogger_check and rc script - tweak

Separate stdout and stderr for more accurate reporting.
Two new libpcp API functions: __pmHashInit(), __pmHashClear.

Used to initialize a __pmHashCtl structure and to free the
hashing data.
Use the new __pmHashInit() and __pmHashClear() API calls.

Update the expected output of qa test 720. Initial qa test output
for test 875.
Add support for local:// and unix:// to __pmUnparseHostAttrsSpec().

Also use the new __pmHashInit() and __pmHashClear() API calls.
Merge remote-tracking branch 'origin/dev' into brolley/dev

Conflicts:
	src/libpcp/src/context.c
Merge branch 'dev' of git://oss.sgi.com/kenj/pcp into dev
Merge branch 'brolley/dev' of ../pcpfans into dev
Remove timezone non-determinism from test qa/536