Improve flow in c1 and link to wider open source movement

01-introduction.Rmd

@@ -8,7 +8,7 @@ However it is even more liberating to create new ones.
 By the end of the book you should be able to create new tools for geocomputation in the form of shareable R scripts and functions.
 
 Over the last few decades free and open source software for geospatial data ('FOSS4G') has progressed at an astonishing rate (see [foss4g.org](http://foss4g.org/)).
-FOSS4G means that geospatial analysis no longer needs to be the preserve of those who can afford expensive programs because anyone can now download high performance spatial libraries on their computer.
+Thanks to FOSS4G and the wider open source movement geospatial analysis is no longer the preserve of those with expensive hardware and software: anyone can now download high performance spatial libraries on their computer.
 However, despite the growth of geospatial software that is *open source*, much of it is still not easy to script.
 Open source Geographic Information Systems (GIS) such as QGIS (see [qgis.org](http://qgis.org/en/site/)) have greatly reduced the 'barrier to entry' have an emphasis on the Graphical User Interface (GUI) rather than the Command-Line Interface (CLI).
 This GUI-centred approach can discourage reproducibility.