MenuCol/DBLtoMenuItem includes last menu item

The wrong setting on a coerce and in range item meant this VI was
erroneously reporting that the last menu item DNE.  Set it to include the
upper limit, and this works now.  Also made sure the error message
reported included the raw index instead of the coerced one.

This commit, plus the following list, fixes #50:
c5274b3
4e7622c
cb2cefc
bbb5660
c502d2f
b249df6
d58d2c0
061d5f0