The new line printing for debug line verbose output was inconsistent. For new rows in the matrix, a blank line followed, whilst the DW_LNS_copy opcode actually resulted in two blank lines. There was also potential inconsistency in the blank lines at the end of the table. This patch mostly resolves these issues - no blank lines should appear in the output except for a single line after the prologue and at table end to separate it from any subsquent table, plus some instances after error messages.
Also add a unit test for verbose output to test the fine details of new line placement and other aspects of verbose output.