Use proper markup for configuration properties and files
Create see also references to the Grid configuration section
Add section about application description, server instances and templates
Fix headings hierarchy and capitalize OMERO
Add paragraph about server-template memory settings
Address various comments made by Mark and Roger
Fix erroneously introduced whitespace
Move JVM memory settings section to the server installation page

As we expect all the sysadmins to read this particular section, the JVM memory
settings section is now directly included into the Server Installation
sections for UNIX and Windows platforms. The link to the advanced server
configuration section is preserved for informative purposes only alongside
with the link to the forum thread.
Move JVM memory settings paragraph post server installation
Merge pull request #646 from sbesson/grid_templates

Improve server-template description in advanced configuration