issue: Move <issue> posts slot into <file-document>.

We move the posts slot of <issue> into the <file-document> parent
class as a commits slot. We also no longer store the creator,
created-date, last-updater, last-updated-date of <issue> in
slots. Rather, we compute them on-demand from the commits slot.

* tissue/file-document.scm: Import (rnrs hashtables), (srfi
srfi-1), (srfi srfi-26), (git), (tissue commit) and (tissue person).
(<file-document>)[commits]: New slot.
(file-document-creator, file-document-created-date,
file-document-last-updater, file-document-last-updated-date): New
public functions.
(read-gemtext-document): Initialize commits slot.
* tissue/issue.scm (file-modification-table-for-current-repository):
Move to (tissue file-document).
(<issue>)[creator, created-date, last-updater, last-updated-date,
posts]: Delete slots.
(<post>): Delete class.
(document-term-generator, print, print-issue-to-gemtext,
document->sxml): Use file-document-creator,
file-document-created-date, file-document-last-updater,
file-document-last-updated-date and file-document-commits instead of
issue-creator, issue-created-date, issue-last-updater,
issue-last-updated-date and issue-posts.
(read-gemtext-issue): Use read-gemtext-document. Do not initialize
creator, created-date, last-updater and last-updated-date slots.

0 files changed, 0 insertions, 0 deletions