Add management of secondary DNS zones

[Kris Deugau]

Minimal: Add/remove zones
Moderate: Allow viewing content of zone, by realtime import for display
Full: Store secondary zone data in the DB, updated on viewing, and allow local override of records

[Kris Deugau]

In 911:

/branches/secondaryzones

First chunk of adding secondary zone management. See #86.

• Menu link
• Zone list page
• Extend getZoneCount() and getZoneList() to read the secondary zone table

[Kris Deugau]

In 914:

/branches/secondaryzones

Add secondary zones to the entity relationship hashes. See #86.

[Kris Deugau]

In 915:

/branches/secondaryzones

Add secondary zone checks to isParent(). See #86.

[Kris Deugau]

In 916:

/branches/secondaryzones

Add first part of secondary zone edit page. See #86.

[Kris Deugau]

In 917:

/branches/secondaryzones

Update _log() to handle secondary zone tag. See #86.

While we're in here, update SQL to use RETURNING instead of trying to
peek at the sequence without disturbing it.

[Kris Deugau]

In 919:

/branches/secondaryzones

Forgot to fill the zone ID in the "edit secondary" template. See #86.

[Kris Deugau]

In 920:

/branches/secondaryzones

Complete secondary zone update section. See #86.

[Kris Deugau]

In 921:

/branches/secondaryzones

Add "new secondary zone" data entry page. See #86.

[Kris Deugau]

In 924:

/branches/secondaryzones

Complete basic secondary zone add. See #86.
Fix a minor missing piece filling the newsecondary template.
Normalize form field names in the newsecondary template.

[Kris Deugau]

In 925:

/branches/secondaryzones

Add import tool for autoaxfr-based secondary zones. See #86.

[Kris Deugau]

In r926:

/branches/secondaryzones

Tweak secondary zone table name for readability. See #86.

[Kris Deugau]

In r927:

/branches/secondaryzones

Add a pair of configuration options for tinydns export of secondary zones. See #86.

[Kris Deugau]

In r928:

/branches/secondaryzones

Fill out autoaxfr branch of tinydns secondary zone export. See #86.

[Kris Deugau]

In 933:

/branches/secondaryzones

Clean up some stray copypasta and correct a permission check to the right
entity type. See #86.

[Kris Deugau]

In 934:

/branches/secondaryzones

Add secondary zone delete to web UI and extend DNSDB::delZone() to handle
initial basic form for secondary zones. See #86.

[Kris Deugau]

In 935:

/branches/secondaryzones

Missed confirmation template for deleting secondary zones. See #86.