crypto: basic crypto functions
crypto - second draft, including suggested changes
crypto: basic crypto functions
crypto - thrid draft
Docstring and test cleanup for the crypto module
Merge pull request #1 from asmeurer/joyner_crypto

Your patch from https://github.com/sympy/sympy/pull/1854/files#r3310621
Merge remote-tracking branch 'github/crypto' into crypto
Docstring and test and html cleanup for the crypto module
Implemented Morse encoding and decoding
Restricting enciphering only to alphabets and digits
Merge pull request #2 from ankit-maverick/crypto

Implemented Morse code and Restricted enciphering only to alphabets and digits
Minor refactoring
Merge pull request #3 from ankit-maverick/crypto

Minor refactoring
Use / or \ in textplot if the function is increasing or decreasing

Before:

0.99845 |                                      ... ....
        |                                    ..        ..
        |                                   .            .
        |                                  .              .
        |                                 .                .
        |                                .                  .
        |                               .                    .
        | .                            .                      .
5.55112 | -.--------------------------.------------------------.-
        |   .                        .                          .
        |    .                      .
        |     .                    .
        |      .                  .
        |       .                .
        |        .              .
        |         .            .
        |          ..        ..
-0.9984 |            ........
          -10                    0                          10

After:

0.99845 |                                      ... ....
        |                                    ..        ..
        |                                   /            \
        |                                  /              \
        |                                 /                \
        |                                /                  \
        |                               /                    \
        | \                            /                      \
5.55112 | -\--------------------------/------------------------\-
        |   \                        /                          \
        |    \                      /
        |     \                    /
        |      \                  /
        |       \                /
        |        \              /
        |         \            /
        |          ..        ..
-0.9984 |            ........
          -10                    0                          10
add support for algebraic functions in minpoly
fix test failures
add tests for minpoly over fraction fields
Fix bug in _choose_factor
minpoly: check that the variable is not contained in the ground domain
minpoly: fix test failures