Change the hook_form_alter hook by the hook_form_BASE_FORM_ID_alter hook

Problem/Motivation

The hook_form_alter implementation is executed on forms where it should not have. hook_form_alter is invoked for all the forms, but we only need to alter the node form at this point.

Proposed resolution

Rename onlyone_form_alter function to onlyone_form_node_form_alter (implementing hook_form_BASE_FORM_ID_alter), that function is guaranteed to be called only node edit/add forms. An we can also access the full node object and its type (even on node-add forms) and eliminate the use of the substr function.

Remaining tasks

None.

User interface changes

None.

API changes

None.

Data model changes

None.