Panel data support and code acceleration using multiple dispatch

We are includig support for fixed effects estimator, and multiple panel data specification tests.
Moreover, it is now possible to choose a vector of fixed variables that will be included in all combinations.
Finally, the core functions have been accelerated throught a refined modulatization and a better use of Julia's multiple dispatch features.
Standar doce runs 30% faster than bedore (and almost 100 times faster than similar Stata code).

v1.0.8

GlobalSearchRegression v1.0.8

Diff since v1.0.7

Improved SVD formula

Fixing minor bugs

Multiple methods

Multiple matrix decomposition methods and data types has been added. See documentation

Cholesky decomposition enabled

Method="fast" allows Cholesky decomposition

v1.0.5

Zenodo update

v1.0.4

v1.0.4 (2019-11-05)

Diff since v1.0.3

Closed issues:

• JuliaCon 2019 - Review (#4)

Merged pull requests:

• Fix typo in README (#3) (Nosferican)

v1.0.3

Model averaging properly working

v1.0.1

Update Project.toml

v1.0.0

Update Project.toml