DeckItem: introduce getTrimmedString()

which is like getString() but with the leading and trailing white
space removed. It is intended for names which seem to not care about
such white space in Eclipse.
Schedule: trim strings which are received from the deck

for SPE-9 only the well/group names contain spurious white space, but
I suppose that other decks also feature them in control modes, status,
etc. so it's probably a good idea to trim these as well...
schedule tests: add some spaces around some names
Merge pull request #155 from andlaus/schedule_trim_names

schedule: do not let us be disturbed by leading or trailing white space in names