Trac #15005: fix ref to SAGE_ROOT that broke %edit

See also:
trac #13432
git 1b96ec30440eac87b7361b7106fb4cae8ecc45a6
Trac #15008: fix some typos in the documentation
Trac #15010: Make Rational.minpoly consistent with NumberFieldElement.minpoly

Make the var parameter of Rational.minpoly() default to 'x', for
consistency with NumberFieldElement.minpoly(). (This is desirable since
is_NumberField(QQ) == True.)
Declare embedding Order -> ambient number field
Trac #14989: Fix conversion of quadratic order elements to CC
Do not pickle caches of toric varieties
make sure simplex_points() works with immutable vectors, too
cleanup of the file incidence_structures.py
correct link to trac
correction in the doc of fast callable
tutorial: Update URL
tutorial: typos
tutorial: update links
Replace 'four' by 'five' in documentation to match number of list items
fr tutorial: remove mention of clisp and openmath

Corresponding change to the English origial:
454f867577c6b6b418fee97fa5778051e149e3d2

See also trac #8328.
fr tutorial: add translation of latex.rst
fr tutorial: document %edit and friends

Corresponding changes to the original version:
2a193149aed587b5026b07b3726647054c9845d4
6664ebedb003253107df7c22fb55da5f1fbda6a3

See also trac #11219, #13823, #14051
fr tutorial: reflect changes in bc8058497885a8a82793d5d621366db2ac14b540
fr tutorial: add translation of tour_coercion.rst

See also trac #8821.
fr tutorial: reflect changes in b1008e96d2bc4a3c2dde7542b285e29cec966766

See also trac #8245.