revlog: refactor chunk cache interface again
- chunk to _chunk
- _prime to _chunkraw
- _chunkclear for cache clearing
- _chunk calls _chunkraw
- clean up _prime a bit
- simplify users in revision and checkinlinesize
- drop file descriptor passing (we're better off opening fds lazily
<table class="slogEntry parity{parity}">
<tr>
<td class="age">{date|age}</td>
<td class="author">{author|person}</td>
<td class="node"><a href="{url}rev/{node|short}{sessionvars%urlparameter}">{desc|strip|firstline|escape|nonempty}</a></td>
</tr>
</table>