Update journal-of-comparative-physiology-a.csl

Updated this style to reflect the current citation style for JCPA. I've used the stile recently for a publication

These are the changes I made:
- removed periods from the end of all entries in the bibliography
- books and chapters are printed without url in the bibliography
- changed the layout for "edited book chapters" in the bibliography
- removed country from "disstertation" in the bibliography
- citations from one author in one year are denoted with a,b,c, etc in bibliography and ciations
- separator for citations changed from & to "and"

I didn't get the indentation to work in zotero's style editor, so unfortunately no indentation (yet)