The ORDER BY clause is causing an error when searching changesets

This fixes part 1° of the issue report

When MySQL sql_mode is set to strict (STRICT_TRANS_TABLES or
STRICT_ALL_TABLES), the DB rejects the date insertions in ISO-8601
format (yyyy-mm-ddThh:ii-ssZ) as sent by GitHub with error "Incorrect
datetime value".

This commit converts the date to ISO-9075 format as accepted per MySQL
documentation [1]

[1] http://dev.mysql.com/doc/en/date-and-time-functions.html#function_get-format

Fixes #39

This plugin is based on the Gitweb plugin as HgWeb/Mercurial are quite
similar to Gitweb/Git. The only missing feature at the moment is the
ability for SourceHgWeb to determine which files were
added/removed/modified with each changeset. The reason is that HgWeb
doesn't give us easy access to this information in the same way Gitweb
does. Hence we will need to manually parse the changeset diff (--- and
+++ lines), checking for /dev/null as a filename in the event of new
files or deleted files.

Ton Plomp contributed a patch in June 2010 to resolve a bug whereby
automatic additions of changesets were not working. Another bug with
incorrect timezone offsets was also resolved. Finally, Ton's patch also
allows for the author email address to be unspecified on a commit.

In October 2010 Marcel Bennett reviewed Ton's patch and made a few minor
changes/corrections. Marcel has also added the ability for the
SourceHgWeb plugin to retrieve a list of files modified in a commit.

I have modified the patch to escape variables before outputting them so
that this plugin is safe from potential XSS vulnerabilities.

Co-authored-by: Ton Plomp <tcplomp@gmail.com>
Co-authored-by: Marcel Bennett <marcel@iamserious.com>

When a commit is authored by A and committed by B, Source_Parse_Users()
function incorrectly sets A's id instead of B's as the committer,
resulting in incorrect changeset information being stored in the DB.

Fixes #44

Function Source_Parse_Users() was simplified by removing nearly
identical code to process the author and committer to a generic function
handling this task for both types of users.

Prior to this, every link to WebSVN (v.2.3.3) created unrendered
template pages. This changes URLs from 'websvn/action.php?path=&repo='
form to 'websvn/repo/path?op=' form.

Fixes #46

Fixes #44

Signed-off-by: Damien Regad <damien.regad@merckgroup.com>

PHP_EOL is valid only for the current instance of PHP, while Gitweb is
perl and potentially running on a different architecture.  Filter CR/LF
explicitly instead.

Fixes #40

On Github the repository names are not required to be lowercase. The
repository name send in the payload-data by Github could be something
like 'RePo-SiTory_NamE'.

In that case the comparison will fail and no import is possible.

Fixes #34

Signed-off-by: Damien Regad <damien.regad@merckgroup.com>

Core framework version -> 0.18
Github -> 0.17
Gitweb -> 0.17
WebSVN -> 0.17