Missed the settings when changing api -> allow to api -> enabled
Fixing #166 showed a deeper rooted issue with line number handling introduced with repetier/sdcard/gcodestreaming

 Something like three wrongs led to one right. Core issue (not starting with line 0 but line 1 and not using the current line but the current line from the gcode file being sent, regardless of reset by M110) should now be rooted out.
Also send identity_changed event on passive login
Always send M110 with the new line number (default 0)

Previously it worked since the first command of every print was forced to be an M110 and the line number at the beginning of each print was always forced back to 0 as well. Now it just uses the actual line number (increased on each sent of a checksumed/numbered line) and resets that when an M110 is encountered. What was missing was forcing the line number of the actual M110 command to the desired line number as well. Should be "more correct" than before now, and work.
Fixed evaluation of "remember login" function