cosmetic changes

removing unnecessary qcustomplot sources into sub folder
Merge branch 'hotfix-0.9.1' into release-1.0
Cleaning.

* Excluded the qcustomplot-lib of the Sources.
* Precompiled them for Win as well as for Linux
* Made a subdirectory for logs and made the lastsettings file hidden
(Curerently only for POSIX-conform OSes
Added precompiled libraries and includes
Updated Readme
Added USAGE file
Added usage instructions and some l10n
* Added Help and about dialogs
* Added corresponding menu entries for usage as well as for about
dialogs
Quick hack: Clear Graphs
Added "new project"
Final cleaning! Release ready. Congratulations!
added empty settings file by default
Merge branch 'release-1.0'