Merge pull request #172 from Useful-Innovation/changes

Changed hard coded units to a constant
Deleted delete on Kompetenser
Merge pull request #173 from Useful-Innovation/davids-fixes

Deleted delete on Kompetenser
added errors on edit
Merge pull request #174 from Useful-Innovation/johans-fixes

added errors on edit
added errors on update purchase/time
Merge pull request #175 from Useful-Innovation/johans-fixes

added errors on update purchase/time
Moved delete form into a function in helpers.php

*Moved delete form into a function in helpers.php
*added titles on the links in index.php and show_closed_projects.php
*removed the welcoming title on show_closed_projects.php