[elpa] externals/org updated (42153ea2fe -> 1a9d0850b6)

[ELPA Syncer]

elpasync pushed a change to branch externals/org.

      from  42153ea2fe Merge branch 'bugfix'
       new  a6fc8d3f1f ox: Handle failure to localize link
       new  8800d28e84 org: Use buffer-base-buffer in safe resource fns
       new  5b076f5057 org-persist: Add missing end quote to docstrings
       new  3b1e7af166 org-persist: Ensure index instantiated before read
       new  e663b90fe5 org-persist: Fix unconditional gc of urls
       new  47654f844d org-persist: Fix number of remote files kept
       new  c91226354a org-persist: Fix attempted mapc-ing of macro
       new  8b8a65ed02 org-persist: Introduce "associated files" for GC
       new  534633d508 org-persist: Use associated file functions for GC
       new  1a9d0850b6 org-persist: Do not re-download url files on write


Summary of changes:
 lisp/org-persist.el | 76 +++++++++++++++++++++++++++++++++++------------------
 lisp/org.el         |  7 ++---
 lisp/ox.el          | 17 +++++++-----
 3 files changed, 66 insertions(+), 34 deletions(-)