Add a rule to check if parameter key  and description are valid for QGIS
too. ApplicationEngine must enforce this rule and TestApplication must
include an additional test case. This can be done as part of refactoring
efforts in ApplicationEngine

New rules for Merge Request acceptance (PSC meeting 2018-02-22)

See merge request !21

Contrast enhancement corrections

See merge request orfeotoolbox/otb!18

Fix clang missing override warnings

See merge request !30

Refactor logging for the whole library

Closes #1515

See merge request !20

STY: Change ITK_OVERRIDE for override in whole code (find Modules -type f -exec sed -i 's/ITK_OVERRIDE/override/g' {} +)

DOC: Create a new chapter with extended filenames and environment variables in cookbook. Document all environment variables

Parameter bool

See merge request !15

App engine flags

See merge request !8