Case insensitive control of allowed extensions for file upload.
Enhancements for upload settings' management :

- Added : allowed extensions (com_media parameter) management in advance settings
- Replaced	 : uploadmaxsize (JConfig parameter) with upload_maxsize (com_media parameter) in advance settings and upload validation.
- Deleted : uploadmaxsize (JConfig parameter) management in install process
Enhancements for upload settings' management :

- Added : allowed extensions (com_media parameter) management in advance settings
- Replaced	 : uploadmaxsize (JConfig parameter) with upload_maxsize (com_media parameter) in advance settings and upload validation.
- Deleted : uploadmaxsize (JConfig parameter) management in install process
Merge branch 'upload_review' of https://github.com/marvinmotion/offiria

Conflicts:
	components/com_account/controllers/account.php
	components/com_account/views/advance/view.html.php

Correction esthétique
Annulation merge accidentel.
Added : lowercase conversion of upload_extensions parameter before update in database for case-insensitive control of allowed upload file extensions.
Merge pull request #1 from marvinmotion/upload_review

Enhancements for upload management