Fixes #629, #642, #644, #648, #655, #657, #658

Fixes #629 (closed) - Email validate issue

Fixes #642 (closed) - vt7: Time Interval Workflows and getMaxAllowedScheduledWorkflows()

Fixes #644 (closed) - Vtiger 7 Quote placement Issue

Fixes #648 (closed) - vt7: Adding a field called "Tasks" breaks the Workflow editor

Fixes #655 (closed) - vTiger 7 - Events - Label text incorrect

Fixes #657 (closed) - Vtiger 7 Reminder not working

Fixes #658 (closed) - vt7: Non-Admin user can't access Calendar Settings...

Usability issues in company logo in dashboard, filters, roles, User's list and detail views