[geos-devel] 2.1 branch and 2.1.2

[strk at refractions.net]

I've set up a branch for 2.1 code line (branch-2-1)

Most ABI-compatible changes since 2.1.1 have already
be applied to the branch.
A new CHANGES file as been added, currently containing:

Changes from 2.1.1 to 2.1.2

- Segfault fix in Point::isEmpty
- Mem Leak fix in OffsetCurveBuilder::getRingCurve
- Bugfix in LineSegment::reverse
- Added multipolygon buffering test in source/test/testLeaksBig
- Ported JTS robustness patch for RobustLineIntersector
- Removed useless Coordinate copies in OverlayOp::mergeZ()
- Avoided throws by IsValid on invalid input
- Stricter C++ syntax (math.h=>cmath, ieeefp.h in "C" block, ostringstream
  instead of sprintf)
- Better support for older compilers (Polygonizer::LineStringAdder friendship)
- Removed useless Coordinate copies in CGAlgorithms::isOnLine()
- Added support for polygonize and parametrized buffer tests in XMLTester
- Fixed support for --includedir and --libdir
- Fixed Z interpolation in LineIntersector


--strk;