fixes feature-test macro. See http://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html
[base] DateTime adds missing assignment operator
[base] Buffer: code cleanup
[base] LogMessage & TimeSpan: adapted to recent changes in Buffer
[base] SqlStatement: implements bindParam<DateTime>()
May thou live in spaces...
[flow] more incremental work on backend IR
[flow] vm: adds binary numerical instructions for (reg, imm) cases
[flow] more work on the backend IR
[flow] *always* constant-fold
flow: snapped
flow: some file system restructuring
flow: some more missing bits
flow: more work
snap
renames
snap
flow: implements jump label offset computation, a first optimization pass, and related.
[flow] much more incremental work on new IR optimization passes and related
[base] Buffer: type-cast fix