Broadcast concurrent calls by campaign off by 1

Concurrent calls is settable in 2 places in this module, on the General Settings tab as well as per Campaign. From what I can tell in testing, the campaign CC setting always allows one more call than is set in the GUI, the General CC setting is counting accurately.

Test 1 - General setting cc=6, campaign has cc=0. Actual cc was 1.
Test 2 - General setting cc=6, campaign has cc=1. Actual cc was 2.
Test 3 - General setting cc=6, campaign has cc=2. Actual cc was 3.

Test 4 - General setting cc=1, campaign has cc=3. Actual cc was 1.
Test 5 - General setting cc=2, campaign has cc=3. Actual cc was 2.
Test 6 - General setting cc=3, campaign has cc=3. Actual cc was 3.

Test 6 - General setting cc=2, campaign has cc=6. Actual cc was 2.
Test 6 - General setting cc=4, campaign has cc=6. Actual cc was 4.

Conclusion: General Setting CC is working correctly, Campaign CC setting is always over by 1 unless restricted by General CC setting.

Second issue - Both CC settings permit the user to enter negative values and 0 which should probably be blocked.