Tweak output of modelicafmt

[mwetter]

In lbl-srg/modelica-buildings#2426, I applied modelicafmt commit 325ef64 with a few tweaks. I suggest these to be added to modelicafmt. The script at the above PR shows the changes, these are

1. If a function has only one argument, then don't do a line break. The reason is that we have many functions such as pre(), der() and others (sin(), ...) that are better to keep on one line.
2. Add an extra line break before equation and initial equation, or initial algorithm and algorithm to improve readability.
3. In the revision notes of the .mo code, there is an extra empty line after the last </ul>. E.g., the file has </ul>\n\n</html> rather than </ul>\n</html>.