(svn r1131) -Add: [Network] Autoclean_companies (set it with 'set autoclean_companies on/off').
When enabled, empty companies (companies with no active clients) with no
password are declared bankrupt after 1 year of emptyness.
For empty companies with password, the password is removed after 3 years
of emptyness.
The delay of removing company/password can be configured via:
- 'set autoclean_protected <months>'
- 'set autoclean_unprotected <months>'