Autoload module o save & preserve post publish date

This small autoload module saves and preserves a Blog Post's publication
date. Unless manually overridden, the first publication date is
preserved.
Added style for new select limit of items to show

Added style for new select limit of items to show for  posts, categories
and tags dashboards.
Auto-submit form on select change

Form auto-submits when number of items to show is changed for Blog
posts, categories and tags dashboards.
Minor changes to 'blog_date'

- Added a description to 'blog_date' field
- Changed setting 'default to today's date' to false. This is so that
the new autoload module BlogPublishDate will work properly.
- Version bumped to 1.3.0.
Version changed to 1.3.0

Version bumped to 1.3.0. in line with changes to ProcessBlog and
addition of BlodPublishDate.
Various updates

- Customisable number of items to show per page in posts, categories and
tags dashboards.  When set by user, value is saved to a cookie (i.e.
state saving). Values set per context (posts, categories and tags) and
per user. Default value is 10.
- In line with the new autoload module BlogPublishDate, Blog Posts
publication dates are now saved by the new module.
- Date column in posts dashboard now sorts correctly
- Dates in date column displayed according to format set by user in
'blog_date'.
- In date column, 'Pending' shown for unpublished posts (if never
published before), 'Expired' for unpublished but previously published
posts and published date for currently published posts.
- Installs BlogPublishDate
- Version changed to 1.3.0
- Some code cleanup