package nsis: enable native 64-bit build and remove multi-lib requirements from docs
Makefile: add error messages for undefined package or url
Makefile: fix indentation of missing url check
Makefile: fix indentation of missing url check
Added the Alure package.

The alure package is an conveniance library for openal that packs certain OpenAL functionality
in a os independent wrapper. It also can use certain audio libraries to extend the type of loadable
audio files. The current package setup depends on all the audio libraries that mxe currently has
and that Alure can handle.

Moved VERBOSE=1 to the end of the make line as per request.

Also moved the cmake_toolchain_file line to the end of the cmake command block.

Moved from a insource to an outsource build of alure with cmake
Fix gtksourceview update script

Fix gtksourceview update script. It could consider .tar.gz suffixes
part of the version number.

Problem reported by Niels Kristian Bech Jensen <nkbj1970@hotmail.com>.
Package fltk: update download URL
Update package gdal
Update package imagemagick
Update package netcdf
Update package netpbm
Update package ocaml-flexdll
Update package pixman
Merge pull request #187 from uklauer/updates

Update some packages
Merge pull request #186 from Roflincopter/master

Adding the Alure package
update package gnutls
packages poppler mdbtools: separate make and install steps
package netcdf: update checksum
doc update: reinstate multi-lib install commands and add note about ocaml* packages
doc update: grammar correction