Use quota in fs_project service

- edit fs_project gen to use another attributes
- edit fs_project slave to use another attributes and set quota if enabled
- create example prescript for fs_project
- create new attributes used for setting quotas (for project)
- create attribute quotaEnabled for facility to set in Perun if quota is enabled on facility

NEED TO DO AFTER ACCEPTING POOL REQUEST:
- create new attribute: gr_d_projectDataQuota
- create new attribute: gr_d_projectDataLimit
- create new attribute: f_d_quotaEnabled
- set them rights for read and write
- add new attributes to required for fs_project service
Shouldn't ^[0-9]+([.][0-9]+)?[KMGTPE]$ be more suitable? It doesn't allow values like  "5.M"