Define HAVE_WORKING_STD_REGEX if, and only if <regex> is usable.
Normally, <regex> should be available and working in any compliant C++11
implementation, however at least g++ 4.8[1] lies about its C++11
compliance: its <regex> is utterly unusable, see [2] and [3] for
details.
[1] Which appears to be (precisely 4.8.5) the version shipped in
CentOS 7, and used on FlightGear's current Jenkins installation.
[2] https://stackoverflow.com/a/12665408/4756009
[3] https://sourceforge.net/p/flightgear/mailman/message/36170781/
Inspired by jQuery.animate() properties can be interpolated using
different easing functions and specifying an animation duration.
Additionally animations can be chained to get table-based
animations like with the current SGInterpolator, or also create
looped animations or other more complicated curves.
Currently this system is not used yet, but it is intended to
replace SGInterpolator and allow more advanced animations of
eg. also colors, for example, for the canvas.
At least one Linux distribution packager of FG has complained that we're bundling expat in our binaries. To keep them happy, add the option (-DSYSTEM_EXPAT=1 at cmake time) to use the system expat instead.
For the moment (and simplicity), this requires building SIMGEAR_SHARED (which is fired to on by selecting the option).
This removes the other still present dependency on osg
in the future sgcore library.
It also remove the need for the NO_OPENSCENEGRAPH_INTERFACE
compile time definition.
Added missing CMake defines for SVN_CLIENT.
Don't detect libsvn without APR.
When installed, enable libsvn support by default (same as for automake).
When enabled, provide libsvn include dir to libtsync.
gitignore temporary CMake files
