Taiga #315 + #323 Create new chapters for 'Using third party software...' and 'Other APIs and protocols'

- Moves 'OCLC connextion gateway', 'Talking Tech' and
  MarcEdit  into a new chapter 'Using third party software wit Koha'
- Moves SIP2 and LDAP sections into a new chapter 'Other APIs and
  protocols' right below the 'Web services' chapter