Performance improvements on EventSources/Cached/tango.search for PANIC 6.2

CHANGES

Since 13.1.1

Adapt to Taurus4
Solve FakeAttributeValue.read() bug
TGet renamed to fandango.tango.finder()
Added fandango.objects.Cached, fandango.debug.Timed decorators
Solve bug on ReleaseNumber operations
Add '~' as negate character for extended regexp
python 3 + pep 8 cleanups
Add host-aware get/put free properties methods
Many improvements on functional/log methods

13.1: Multi-host panic and ServersDict api's

Solve bugs on EventSource/Listener API
Improve tango module performance (check_device, get_matching*)
Add quality boolean flags (.ALARM, .WARNING) to attribute values on TangoEval
Add microseconds on time related methods
sysargs_to_dict: added multiarg/multiflag/splitter arguments
Bugs solved in drag/drop API
Solve infinite queue bug in WorkerDS