Perusatproc

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- Rename OTB_ENV_PATH for OTB_PROFILE_PATH
- Fix OTB profile activation on Linux/OSX

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- Store intermediate results on destination directory when using perusat_process.
- Delete temporary files if processes (and subprocesses) finish successfully.
- Upgrade default SRTM DEM files with 1-arc second (~30m GSD) instead of 90m.
Also now they are stored with no compression for faster orthorectification
processing.
- Add new --spacing argument for orthorectify and process console scripts to
set resampling spacing size (by default uses 15m, which is half the GSD of
the bundled SRTM DEM files).

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- Bugfixes related to perusat_orthorectify CLI script.

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- Applied nodata fill algorithm to SRTM DEM to avoid artifacts when
orthorectifying.

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- Support optional OTB_ENV_PATH environment variable, to load OTB environment
only when running OTB CLI commands internally.
- Various bugfixes for making it work on Windows.

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- Basic processing scripts for calibration, orthorectification and
pansharpening.