changed LFO ammount to absolute value.
Instrument view: Restrict mouse wheel tab switching

Only switch the view's tab when the mouse pointer is hovering over the tabs. Closes #712.
When removing a track, remove its solo state

Fixes #1103
Piano Roll: Don't switch to select mode when pressing Ctrl+A

Or don't act like we did. Fixes #431
Merge pull request #1351 from curlymorphic/stable-1.1

changed LFO amount to absolute value.
Merge branch 'stable-1.1'

Conflicts:
	plugins/delay/delaycontrolsdialog.cpp
	plugins/delay/delayeffect.cpp