Docu-Enhancements on V11.4: Homogenizazion and reordering

I've made several enhancements (esp. to get things more homogenized) on the documentation.
One major other thing I made, was reordering the contents of "Basic_Help" to put the things together. This allows for example a more meaningful target when linking to things on this page (for example: all sections concerning paste mode are grouped together now ... so when linking to "Paste Mode" you will be directed to a section which has all features of paste mode represented comprehensively ....)

For more details on my changes see the commits itself ...