Tweaks/Fixes + new reports + Tablet metrics

[na6vj]

• Analysis mode: option --OUTPUT=STDOUT for debuging
• Internal tracking for preferred region
• New views:
  • q_detail
  • client_summary
  • slow tables
• Save Tablet metrics

[na6vj]

Keeping initial commit for LDAP code. This will get overwritten when the ian-ldap branch is committed.