dblatex sets wrong package base path

Description:

The script /usr/bin/dblatex sets a wrong package_base path exactly in this line:

package_base = os.path.join(os.path.dirname(sys.argv[0]), "..")

which resolves to /usr instead of /usr/share/dblatex, which make compiling documents fail. In version 0.3.12-7 this path is set correctly.

Additional info:

• package version(s): 0.3.12-8
• config and/or log files: See example below
• link to upstream bug report, if any: None

Steps to reproduce:

1. Create an example file hello.xml using this sample document from wikipedia.
2. run dblatex -o hello.pdf hello.xml
3. This fail with

$ dblatex -o hello.pdf hello.xml
Build the book set list...
warning: failed to load external entity "/usr/xsl/latex_book_fast.xsl"
compilation error: file doclist.xsl line 6 element import
xsl:import : unable to load /usr/xsl/latex_book_fast.xsl
warning: failed to load external entity "/usr/xsl/common/mkdoclist.xsl"
compilation error: file doclist.xsl line 7 element import
xsl:import : unable to load /usr/xsl/common/mkdoclist.xsl
Unexpected error occured
Error: xsltproc failed

Note that it attempts to search for files located in /usr/xsl instead of /usr/share/dblatex/xsl

Downgrading to 0.3.12-7 or setting package_base = "/usr/share/dblatex" makes the compilation succeed.

FWIW, I discover this issue while trying to compile the AUR package dia-git.