LinGui: refresh x264 tab

LinGui: refresh x264 tab
updated layout, labeling & tooltips
group options by encoding features, analysis options, and psychovisual options
change b-pyramid from checkbox to combo box to support None, Strict, and Normal options
expand psy-rd slider range to 0-2 (was 0-1)
relabel "Analysis" to "Partitions".
Add new "Most" option to Partitions that is the same as the old "Some"
Change "Some" option of Partitions to mean i4x4:i8x8
add weightp combo
add adaptive quantization strength slider
remove weightb checkbox
remove no-fast-pskip checkbox

git-svn-id: svn://localhost/HandBrake/trunk@3381 b64f7644-9d1e-0410-96f1-a4d463321fa5