Removed bug that caused NumberFormatException when selecting a blank option for execution year in incoming mobility portal
Added error message for invalid mechanographical numbers
Merge pull request #554 from AfonsoFGarcia/ticket/421334

Added error message for invalid mechanographical numbers
Cron script for automatically setting a students photo from his candidacy process.
Bug fix: added missing forward mappings; removed unused methods
Merge pull request #555 from AfonsoFGarcia/ticket/421389

Removed bug that caused NumberFormatException when selecting a blank option for execution year in incoming mobility portal
Bumped version for release of 3.7.1
Merge branch 'release/3.7.1' into develop
Bumped version for development after release.