Better formatting of inline block-comments

[nene]

Previously all block-comments were formatted on a separate line, like:

SELECT 1 /*com1*/ + 2 /*com2*/;

would get formatted as:

SELECT
  1
  /*com1*/
  + 2
  /*com2*/;

After this change the result is more like one would expect:

SELECT
  1 /*com1*/ + 2 /*com2*/;

Only when the block-comment spans multiple lines or is preceded by a newline will it be formatted as before: on a separate line of its own.

The formatting is still not ideal, but it should work well for most common scenarios. Sometimes the comments don't get nicely padded by spaces on both sides, as one can see in the tests, but these are some pretty odd scenarios, like placing comments between table and column name table /* */ . /* */ col, something one really rarely does in real world.