Template: breadcrumb - small fixes

- undefined variable on author page
- wrong html structure on hierarchical page
Template: breadcrumb - category structure

The html structure of multidimensional categories was wrong ($before &
$after was missing).
Display on blog (if not front page)

The breadcrumb should be displayed on the blog page, if it's not the
front page.
Merged: 65e6bf5aed5c88a00b530b8c08c8f7e80299f09f
Small fixes
Added WP Active Plugins In System Status

Although there is list of plugins which were installed but will be informative if number of plugins is displayed before getting list. This will count and display the number of plugin installed and used in the environment section.
Better Text-Domain maintained...
Semantic script adapted

@mikejolly I have used id `#status` instead of class `wc_status_table`. Look this `jQuery( '#status thead, #status tbody' )....` and `<table class="wc_status_table widefat" cellspacing="0" id="status">`. Thus will not harm anything. Additionally, I have adapted the sementatic jQuery script here.
Fix some duplicates entry.
Fix for Unnecessary spaces used
Using Time Constants to set transient

Rather that '60*60*12` we can use `DAY_IN_SECONDS` which is equivalent of `60*60*24`. Let's use one day rather than (1/2)day as it seems better.
Define a margin for the input.qty

* This is needed, as it seems on at least Safari/Chrome it would push the -
  button down outside of the text field
* Tested on OS X Mavericks
Merge: master
Fixed: merge conflict
Fixed: merge conflict
Time constant in theme set_transient too...
Ignorance fir logs files excluded.

WC_LOG_DIR is different from `/logs` and this directory is not created anymore in this root directory...better do remove logs from ignorance.
Only add the 'do_not_allow' if target user ($args[0]) is set.
Fixes #6095.
Fix "remote" typo - should be "remove"
Added the use of home_url()