Dr1() is being replaced by stochastic_solvers()

In order to clean the code and accomodate for additional solvers, we have removed function dr1.m and replaced it by stochastic_solvers.m. Depending on user’s choices, stochastic_solvers calls different solvers for local approximation of stochastic models.
This change occurs only in the unstable version of Dynare and is meaned to be included in version 4.3, when it appears.
Usually, we don’t comment on changes to internal functions of Dynare, but as dr1.m is at the core of local approximation and is known by lots of users, we thought necessary to inform you.
Additional details are available at dynare.org/DynareWiki/BreakingDr1