[elpa] externals/xr updated (7ba1fc6 -> e1c7734)

[Mattias Engdegård]

mattiase pushed a change to branch externals/xr.

      from  7ba1fc6   * xr.el: Fix compilation and use valid email address
       new  8425772   Sync with ELPA: compilation workaround
       new  8532df8   Move tests to separate file
       new  2a1de75   Correct parsing of group and backref
       new  4bf6043   Export xr-pp-rx-to-str and fix a typo
       new  4e2bd17   Export xr-pp-rx-to-str and fix a typo
       new  37b2bcb   Merge branch 'master' of https://github.com/mattiase/xr
       new  e8ec2d9   Add reference to the pcre2el package
       new  c2ede95   Improved errors for bad \s and \c sequences
       new  8d052d6   Check for errors in \_
       new  0331e00   Recognise \sW as alias for \sw
       new  41474cb   Accept unknown character categories
       new  f79d50c   Add categories L, R, . and SPC
       new  e1c7734   Merge branch 'externals/xr' of elpa.git (no actual change)


Summary of changes:
 xr-test.el | 243 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 xr.el      | 270 +++++++++++++------------------------------------------------
 2 files changed, 297 insertions(+), 216 deletions(-)
 create mode 100644 xr-test.el