Applied word wrap to pop3_connector module documentation. Refs #2954
POP3 connector manual updated. Refs #2924

Added index, references, gui labels and interface description.
POP3 Connector: added References section. Refs #2924
"download site" macro as labeled link.
Whitespace and formatting changes
Moved "install from USB stick" to Install from CentOS section.
Added section names and index entries