Makefile fixes to allow building packages

- stop using apxs to install apache module
- add support for DESTDIR
first version of a mapcache.spec file, based on the mapserver.spec file
remove unnecessary typedefs
add http global request timeout
fix TMS service resource for individual tileset

mapserver/mapserver#4530
Merge branch 'branch-1-0'
fix apxs typo
Merge branch 'branch-1-0'
Switch to a Cmake build system (RF92)
allow configurable iteration mode in seeder

for classical google and wgs84 grids, will default to drill down
mode which is optimized to take advantage of data caching on the
source wms server. other grids will use classical "level by level"
mode as custom grids are not adapted to drill-down iterating (yet?)
Implementation of mapguide http request protocol
remove unused after cmake transition
remove debug entries from config file
free allocated images as early as possible

When doing vertical+horizontal assembling, there was an
important buildup of allocated image bytes that was not freed until
the current request was over. The current patch frees temporary
images as sson as we are over with them.
add support for "read-only" tilesets
init impl
sqlite time dimension db support, work in progress
wip (2)
wip (3)
add timedimension to seeder