pimage: added -anchor {n|w|s|e|nw|ne|sw|se|c}
pimage: implemented/added -fillopacity 0.0-1.0 -tintcolor COLOR -tintamount 0.0-1.0 options

WIN codes written by Andras Varga
demos: added example for pimage -width/-height and -fillopacity
demos: some files contained old Mac line endings (CR only)
demos: test linear gradient and -fillopacity
TMP: demos
textanchor demo
bugfix on linux: -strokedasharray should use relative to strokewidth
demos: fixed demo names (should be unique)
demos: text bold/italic
pimage: added -interpolation {none|fast|best} option
disable error: 'matrix ... is close to singular'
doc: added pimage -anchor, -tintcolor, -tintamount, -interpolation
pimage: added -srcregion { x1 y1 x2 y2 } option
implements arrowheads on pline, polyline, path objects
doc: pimage options moved to pimage