Fix app doesnt showed in desktop

Related to #607, #608 and this discussion on GGroup

https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/erpnext-developer-forum/cQMhAZAFiF4/7B8GHkH4RZ0J
Merge pull request #629 from MaxMorais/patch-4

Fix app doesnt showed in desktop
Do not validate links, selects, mandatory, etc. on cancel
Merge pull request #631 from anandpdoshi/anand-wip

Do not validate links, selects, mandatory, etc. on cancel
new feature: dynamic links :boom:
dynamic_link_fix
dynamic_link_fix
Save naming series in property setter before reload
added upload / download in user permissions
reverted common_keys
removed print
user permissions, show buttons only for system manager
change default max_file_size to 3MB, its 2014
Merge pull request #633 from anandpdoshi/anand-wip

Save naming series in property setter before reload
form prev/next fix and file_order fix
Merge pull request #632 from rmehta/develop

new feature: dynamic links :boom:
fix bad attachment urls and encode them
Merge pull request #635 from pdvyas/hotfix-attachment-url

fix bad attachment urls and encode them
hotfix in permission
Fixed comment deletion