Shrimp Shader Generator FLTK2 GUI (SVN)

The clamped_texture function (4 pairs of texture coordinates), was using tt instead of tt2 in the 1st pair. This is fixed to tt2 as it should be, for both float and color clamped_texture. There was a problem in the "box" projection when getting filterwidth of ST coordinates - filterwidth uses Du() and Dv(), and was being called inside varying conditionals. This was fixed, the filterwidth(ss) and (tt) statements are moved outside the varying conditional. Minor cleanups in texture functions.

NEW: added the 'array' type, not yet functional

ENH: Escape key doesn't close Shrimp anymore

-Add copy/paste of blocks: second pass after paste the selection is toggle on the new pasted block you can move them by click and drag on one of them.

-Add copy/paste of blocks: first pass(need to do copy/paste for group and tweak paste location for visiblity ,right now the paste is at the same location of the original copy)

Added lichen on (basaltic) stone example.

-Bug fix on deleting single block after a marquee selection.
-Add some comment in the code

Changed default occlusion map (for depth mapped occlusion) to "".

Fixed xyz/comp problems in helpers header (blame the wous). Added bronze material example network (it expects one of Paul Debevec's envlatl TIF in /tmp/, grace-new.tdl).

Small fixes to some blocks, when renaming pads to more meaningful names, some of the code in the blocks retained older names for variables, with the ensuing chaos that followed.