ENH: Ensure RAM parameter is used by persistent filters (should be applied likewise for all applications)

The "count-insert" idiom is an antipattern that leads to searching the
element twice. Avoid that and also the 0 comparison a bit below.

In addition, cache the end iterators of the two maps. This is safe as
the iterators stay valid when the map is modified.

TEST: Changing output data format to .img because gdal < 2.0 does not handle properly the AREA_OR_POINT georeferencing for tiff format

Bas Couwenberg authored 8 years ago and Rashad Kanavath committed 8 years ago

This patch is authored by Bas Couwenberg <sebastic@debian.org>