Added pgfplot compatibility configuration to the preamble of the files

Minor tweaks to the README

Added runtime checks for the --xelatex and --pdflatex option

This is necessary so that xelatex and pdflatex can be marked as optional
dependencies in package managers.

There are no checks for lualatex since it is the default TeX engine,
i.e. is is required for the application to function.

Made the install make target configurable

Also removed the install script from the repo and added notes on dependencies to the README

Minor improvements in the script

Minor change in the binary

I'm trying to make the script safer and more efficient

Updated the example

Removed depricated option from make target

Updated the changelog

Updated the version number

Preparing for a new release

Removed runtime checks for dependencies

Now the dependencies are only checked by the install script

Made the TeX engine configurable via command-line flags

Also updated the documentation

Minor correction to the README

Added aditional links to the documentation

Updated the version number in the manpage

Updated the version number in the documentation

Improved the installation scripts

Fixed #1

Replaced uppercase variable names for lowercase variable names

Minor changes to the Makefile