Fixes and improvements in the Transform dialog (Ctrl+Shift+M):

- The "Apply to each object separately" checkbox is added, allowing you to scale/rotate/skew each selected object by the same amount, around that object's center. When off (by default), the selection is transformed as a whole. The status of this checkbox is remembered across sessions. (It has no effect on Move and Matrix tabs).

- The new Clear button resets the values on the current tab to defaults.

- The Scale tab now allows you to specify horizontal or vertical size increments in percentage or absolute units. Also there's a "Scale proportionally" checkbox which ensures that scaling preserves the width/height ratio. (If you are scaling several objects proportionally with "Apply to each object separately", you can only use the % unit to specify the scaling; otherwise each object's scale increments will have the width/height ratio of the entire selection, not of that specific object.)

- The Skew tab can now specify the skew as an absolute displacement (e.g. for horizontal skewing of a rectangle, that means the shift of the top rectangle side relative to the bottom), as percentage displacement (e.g. a 1% horizontal skew of a rectangle means shifting the top side by 1% of the rectangle height), or as an angle (e.g. horizontal skew by 15 degrees results in the sides of a rectangle being rotated to that angle, while the top and bottom remain horizontal).

- The Matrix tab (previously called "Transform") can either edit the current transform= matrix of an object, or post-multiply the transform= with the matrix you specify, depending on the "Edit current matrix" checkbox. As it is now redundant, the matrix in the Object Properties dialog is removed.

- The dialog now correctly watches selection changes in the active document window and updates its values accordingly.

- The layout of the dialog is simplified, tooltips and mnemonics added for better usability.

- Many bugs are fixed, especially in value conversions between units.

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