add horizontal-alignment="adjust" with immutability of style objects in
mind
update visual test - horizontal-alignment="adjust"
sqlite plugin - disable shared cache for sqlite prior to 3.7.15
no need to initialise `evaluated_xxx' structures as initialisation happens at evaluation step
add new line
Merge pull request #2528 from mapycz/fix-plugin-sqlite-shared-cache

sqlite plugin - disable shared cache for sqlite prior to 3.7.15
fix possible out-of-bounds write [coverity]
fix casting to doubles
initialize all member variables
cairo_gradient: fallback to radial if the class is misused to prevent crash on uninitalized pattern
improve register_datasources + drop filesystem v2 support since v3 is default in boost >= 1.46
Avoid BOOST_MPL_LIMIT_VECTOR_SIZE redefined warning
Merge pull request #2523 from mapycz/halign-adjust-immutable

halign adjust with immutability of style objects in mind
make tolerance_iterator exponential
update agg reference images
update cairo reference images
update grid reference images
close sqlite db after testing
get sqlite rtree tests passing on windows - refs #1871 and #2530
remove unneeded boost/cast.hpp header