Implementation of erfc and it's tests
Minor fixes and added few methods
Minor fixes
Implementation of erfi
Minor fixes
Minor fixes
Make erfc and erfi functions available to MeijerG integration code
Merge pull request #1 from raoulb/error_meijerg

Make erfc and erfi functions available to MeijerG integration code
Add a hyperexpand rule to simplify a particular 3F3 instance

Background: The solution of some integrals like

    integrate(erf(a*z)/z**2, z)
    integrate(erfc(a*z)/z**2, z)
    integrate(erfi(a*z)/z**2, z)

yield certain 3F3 and we would like to simplify further.
For that we need the rule:

    http://functions.wolfram.com/07.31.03.0134.01

which indeed does the job for any 3F3 of the form:

    hyper([1, 1, a], [2, 2, a+1], z)

for a unequal to 1.
Merge pull request #2 from raoulb/error_3F3

Add a hyperexpand rule to simplify a particular 3F3 instance
Manually tuned version of the 3F3 expansion rule
Merge pull request #3 from raoulb/error_3F3_tuned

Manually tuned version of the 3F3 expansion rule
Implementation of erf2, Ierf, Ierfc, Ierf2 and their tests
Minor fix
Merge remote-tracking branch 'github/error' into error
Name fix for Inverse Error Functions
Fix test failure due to wrong matrix shape in hyperexpand
Make erfc and erfi functions tractable for Gruntz algorithm
Merge pull request #1 from raoulb/error_gruntz_tractable

Make erfc and erfi functions tractable for Gruntz algorithm
Fix the real/imag part splitting of expressions involving erf, erfc or erfi