Fix typos

[neteler]

Fix a few typos using the source code spell checker available in the GRASS GIS utils/ directory:

sh $HOME/software/grass_main/utils/fix_typos.sh
# ... interactive fixing of found typos by yes/no
./src/grass_gis_helpers/general.py
        percent(int): number of percent which shoud be used of the available
	shoud  ==> should (Y/n) y
FIXED: ./src/grass_gis_helpers/general.py
./src/grass_gis_helpers/data_import.py
        all_raster (list/dict): Empty list/dictonary where the imported rasters
	dictonary  ==> dictionary (Y/n) y
...

# cleanup of tmp dir
rm -rf fix_typos/

[juleshaas]

Thanks! I'll merge it directly, as we are about to create a new release.