gd: fix proto comment

gd: provide imageflip with system libgd when available

gd: fix proto comment

fix copy/paste in error message

(re)allow WBMP detection with system libgd
provide getbmi and skipheader not exported functions in gd_compat.

temporary disable WBM detection with system libgd, as gdGetC, getmbi and skipheader not exported

lucky that the name is not used, fix name of encoder

add external 2.1 detection and fix gd_compat for 2.1+

fix BELL constant declaration

add WebP support in phpinfo

FALSE on error

fix regression, take #2 (merge issue due to git 1.8 default setting changes)

- fix regression (imagerotate_overflow.phpt), fix for all cases

- fix regression bug24155.phpt and bug39366.phpt

- fix regression (imagerotate_overflow.phpt)

- add imageaffinematrixget and imagematrixconcat

- add affine matrix helper for translate, scale, rotate and shear

- add new interpolation method
. imagescale
. imageaffine
. replace imagerotate with new generic and optimized new implementations
. imagesetinterpolationmethod, to set the de

- add new interpolation method
. imagescale
. imageaffine
. replace imagerotate with new generic and optimized new implementations
. imagesetinterpolationmethod, to set the default interpolation to be
used with the new functions
. add imagepalettetotruecolor

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- (s)rgb distance works way better for now, re enable threshold

- disable threshold for now, will enable it again using CIEDE2000

- clean and enable threshold

- add image crop support

- typo

- fix name for imageflip constants, consistent witht the other

- add constants for imageflip