Resolve "allow to open multiple data overlays using url GET param"

Closes #595 (closed)

added 18 commits

• 4bbe9b50 - header always show adminLink
• 3c131d3f - styling moved to css
• 5b90c810 - jshint issues
• b31b23a5 - ServerConnector references changed into local getter
• 4a13af7f - unit test checking if menu is opened properly
• 36a1ea18 - url is always reset before test start
• deed0773 - opening submap changes url GET parameter
• 7bb6194f - x,y coordinates are updated in url when map moves
• 46b88f56 - url is updated at most 4 times per second
• 5da9d28a - change of zoom on map is reflected in the url
• b43122f7 - url is updated every 4 seconds in necaessary
• 9f4c4c9a - comments toggle changes url GET parameter
• dc58851c - lint issues
• 8eaa5eb9 - search modifies GET parameter in the url
• 4a358f8b - data overlay ids are stored in url GET param
• 52699f91 - search by coordinates url parameter contains zoom level
• 92761761 - search by drug, mirna, chemicals is supported via url GET parameter
• 19c74aba - changelog added

Compare with previous version

unmarked as a Work In Progress

mentioned in commit c38115bf

merged