Reogranized some parts of the installation instructions, most notably folded up the three commands that are explicitly hinted at during the "make install" process.  Added handling of Apache group write privileges.  Other minor text updates.
Reogranized some parts of the installation instructions, most notably
folded up the three commands that are explicitly hinted at during the
"make install" process.  Added handling of Apache group write
privileges.  Other minor text updates.

tiborsimko/invenio,inveniosoftware/invenio,inveniosoftware/invenio,tiborsimko/invenio