Update I2NP spec for prop. 156
Clarify prop. 154 based on subsequent decisions made in prop. 156
Add more notes common structures spec about ECIES routers
Add notes in more places that tunnel ID must not be zero
* ctags are case-sensitive, and the dataspecs use CamelCase.
* HTML anchor tags are case-sensitive. The old specs used CamelCase to match the
ctags, and the existing documentation references them extensively.
* reStructuredText links are case-insensitive, and the HTML anchor tags that it
generates are lower case.
Therefore, the links in the .rst files are given in CamelCase, and the dataspec
formatters convert this to lower case for links. In direct HTML references (in
specs or other areas of documentation), lower case must be used (to be fixed).
Command to generate the file:
cd i2p2www/spec && ctags -f spectags --langdef=rst --langmap=rst:.rst --regex-rst=/_type-\([a-zA-Z0-9]+\)/\\1/t,type/ --regex-rst=/_struct-\([a-zA-Z0-9]+\)/\\1/s,struct/ --regex-rst=/_msg-\([a-zA-Z]+\)/\\1/m,msg/ -R -n *.rst
