removed optim module; moved its functionality to core and photo modules; moved drawing functions from core to imgproc. Removed FilterEngine etc. from public API

Whitespaces removed

Removed conflict

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Removed opencv_extra folder inside opencv folder

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All 3 modules Updated

Both modules added

ReST directive was used. Also fixed some other ReST directives that were
not correct and removed some warnings during buildbot checks.

- Used lunix style slashes - works on most systems
- Removed all trailing whitespaces

This reverts commit fba72cb6, reversing
changes made to 02131ffb.

All errors were found by doc/check_docs2.py

All errors were found by doc/check_docs2.py