new angle-scan processing features, update documentation, bugfixes

new functions:
- voigt_fwhm_lor
- rotate_hemi_scan
- import_tpi_scan
- draw_diffraction_cone

updated functions:
- interpolate_hemi_scan
- display_hemi_scan
- duplicate_hemi_scan

updated documentation:
- installation instructions
- readme

README.md

@@ -0,0 +1,34 @@
+Introduction
+============
+
+PEARL Procedures is a suite of Igor Pro procedures developed for data acquisition and data processing at the PEARL beamline at the Swiss Light Source.
+
+
+Installation
+============
+
+PEARL Procedures should be installed according to the regular Igor Pro guidelines. Please read the Igor help `About Igor Pro User Files` for details.
+
+- Make a `pearl-procs` directory in your private or shared `User Procedures` folder, and copy the PEARL Procedures distribution there.
+- Create shortcuts of the `pearl-arpes.ipf` and `pearl-menu.ipf` files, and move them to the `Igor Procedures` folder next to your `User Procedures` folder.
+- Find the `HDF5.XOP` extension in the `Igor Pro Folder` under `More Extensions/File Loaders`, create a shortcut, and move the shortcut to the `Igor Extensions` folder next to your `User Procedures` folder.
+- Find the `HDF5 Help.ihf` next to `HDF5.XOP`, create a shortcut, and move the shortcut to the `Igor Help Files` folder next to your `User Procedures` folder.
+
+
+License
+=======
+
+The source code of PEARL Procedures is available under the [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0) at <https://git.psi.ch/pearl-public/igor-procs>.
+Users of PEARL Procedures are requested to coordinate and share the development of the code with the original author.
+Please read and respect the respective license agreements.
+
+Author
+------
+
+Matthias Muntwiler, <mailto:matthias.muntwiler@psi.ch>
+
+Copyright
+---------
+
+Copyright 2009-2016 by [Paul Scherrer Institut](http://www.psi.ch)
+