CETAF triple store frequently not available

The BotanyPilot frequently throws exceptions due to a failed connection to the CETAF triple store. The reason for this is unknown.

Solution: As a workaround, a second attempt to connect to the triple store has been implemented. In addition, errors when establishing a connection will be logged from now on (in php error log).

Code:

error_log("Logging: CETAF Triple Store not available at L1! Try to query a second time.", 0);

error_log("Logging: CETAF Triple Store not available at L2! Exit.", 0);