man pages: Fix typos

Fix several typos in manual pages of pdftops and pdfseparate.
Merge remote-tracking branch 'origin/poppler-0.22'
Update copyrgihts
News file
Increase version number to 0.22.3
Increase poppler core soname
Merge remote-tracking branch 'origin/poppler-0.22'

Conflicts:
	poppler/TextOutputDev.h
Check for strcpy_s() and strcat_s() at configure time

It is better to test for functions than to hardcode exceptions for
specific compilers.

This fixes compiling poppler with the latest mingw-w64 compiler which
has strcpy_s() and strcat_s() build in.

Bug #63459
Merge remote-tracking branch 'origin/poppler-0.22'
Remove unused variables from Lexer::getObj()

https://bugs.freedesktop.org/show_bug.cgi?id=63467
Splash: Always consider a softmask transfer function

Fixes bug 63587 in splash
Merge remote-tracking branch 'origin/poppler-0.22'
cairo: Always use the trasnfer function if present in setSoftMask

"If the subtype is Alpha, the transparency group XObject G shall be
evaluated to compute a group alpha only. The colours of the constituent
objects shall be ignored and the colour compositing computations shall
not be performed. The transfer function TR shall then be applied to the
computed group alpha to produce the mask values."

We were using the transfer function only for luminosity soft masks.

https://bugs.freedesktop.org/show_bug.cgi?id=63587
cairo: Always use the trasnfer function if present in setSoftMask

"If the subtype is Alpha, the transparency group XObject G shall be
evaluated to compute a group alpha only. The colours of the constituent
objects shall be ignored and the colour compositing computations shall
not be performed. The transfer function TR shall then be applied to the
computed group alpha to produce the mask values."

We were using the transfer function only for luminosity soft masks.

https://bugs.freedesktop.org/show_bug.cgi?id=63587
Make sure getKids returns != 0 before using it

Fixes crash in bug #63909
Do not start drawing a form we are already drawing

Bug #63190
Make sure getKids returns != 0 before using it

Fixes crash in bug #63909
Do not start drawing a form we are already drawing

Bug #63190
Update my C of the last two previous commits
Merge remote-tracking branch 'origin/poppler-0.22'

Conflicts:
	poppler/Gfx.h