Changes:
* license change to LGPL
* added new Tijs Michels spline implementation
* small fixes in spline package
* added g2_spline_demo.c
* removed some non ansi parts (e.g. // comments)
* added query pointer for X11 (mouse)
* other small fixes and changes
pkgsrc. Instead, a new variable PKGREVISION is invented that can get
bumped independent of DISTNAME and PKGNAME.
Example #1:
DISTNAME= foo-X.Y
PKGREVISION= Z
=> PKGNAME= foo-X.YnbZ
Example #2:
DISTNAME= barthing-X.Y
PKGNAME= bar-X.Y
PKGREVISION= Z
=> PKGNAME= bar=X.YnbZ (!)
On subsequent changes, only PKGREVISION needs to be bumped, no more risk
of getting DISTNAME changed accidentally.
