Enable javac and javadoc HTML checks. This implies:
- Moving MathML formulas in a separated file
- Avoid using the 
 tag in CommonCRS
- Fix misplaced <p> tags in NetCDF AttributeNames


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1591900 13f79535-47bb-0310-9956-ffa450edef68