[Ohrrpgce] SVN: teeemcee/10275 Disallow "select menu item" on unselectable items.

[subversion at HamsterRepublic.com]

teeemcee
2018-03-31 04:37:31 -0700 (Sat, 31 Mar 2018)
212
Disallow "select menu item" on unselectable items.

Reason being that the selection will be moved on the next tick anyway.

Rather than show an error, I decided to make it return true on success.
Fairly arbitrary
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U   wip/docs/plotdict.xml
U   wip/scriptcommands.bas