Version 1.1.5: Allow installation of template in a slave site when using specific folder

In prior version, when using a specific themes (template) folder for a slave site it was not possible to install new template or event delete some of them. Only the replication of the template was performed.

With this new version, it is now possible to install specific theme in as slave sites when a specific folder is specified.
Remark: For compatibility with standard Joomla, the themes folder must be terminated by "/templates".

Fix also a bug when deleting a slave sites to correctly remove the domain URL path recognized by JMS.
In the previous version, the internal JMS dimain index was not refreshed and therefore the URL was still detected event when the files was not present.
In previous version, the internal index was only refresh when a slave sites is saved.