Added some young Rosenbrock-Ws with SSP explicit part

Hg-commit: a57600e860326f05d446be5f2b5b5fa48df6caa6

Add two Rosenbrock schemes from Sandu's atmospheric chemistry paper

Hg-commit: 1f4724f3d8578470ed4f96270df53218bfdba7e9

Add very preliminary implementation of CFL-based adaptive controller

Hg-commit: f52bccda5a20d5d7102ebeba01c8d80b001a9ed7

Merge TS adaptivity work, some conflicts with Emil's explicit stages for Rosenbrock

In merging Emil's work, I added a flag for an explicit stage instead of
redirecting through a different function.

Merge TS adaptivity work, some conflicts with Emil's explicit stages for Rosenbrock

In merging Emil's work, I added a flag for an explicit stage instead of
redirecting through a different function. It is less code and more
clear, I think.

Hg-commit: 1aa32ce28475592f35bc148baeecb41ed3995a50

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More work on adaptivity, adaptive controller is basically working, but still need hooks for stability

Hg-commit: f48fa83e97661b95405cb52b6c25ca4a7e867ce8

Augment Rosenbrock-W schemes to allow explicit stages

Hg-commit: e78c67c44825354ce793a4ea743c43a5c56ee571

Implement some Rosenbrock-W schemes for index 1 PDAE from Rang & Angermann 2005

Hg-commit: 5ddc0caf29f2584beedde2dd7e761c3c24388ce8

Bug fix and improved output for TSView_RosW

Hg-commit: f2e9ed77a998fd1bb8d07398a60233c7c71296c9

Add basic Rosenbrock-W implementation

This provides two second order L-stable methods. There is currently no
error control and no dense output.

Hg-commit: 58348b820d6154134de487525f8fbd0e0710aff0

TS: Move code from elsewhere to TSStep()

Hg-commit: 11d1bb58cf2ee8f572513a93f8aed92abab6397d

TS: Many changes listed below

* Remove ts->initial_time_step
* Remove ts->next_time_step, add ts->time_step_prev
* Implement interpolation for TSALPHA
* Prepare for time step adaptativity

Hg-commit

TS: Many changes listed below

* Remove ts->initial_time_step
* Remove ts->next_time_step, add ts->time_step_prev
* Implement interpolation for TSALPHA
* Prepare for time step adaptativity

Hg-commit: a1e380cf44925342fc0696a9599f8993e2c20644

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Prepare for Rosenbrock-W schemes

TSROSW is a copy of TSARKIMEX that Emil will be modifying to implement Rosenbrock-W schemes.
Enable by configuring --with-rosw.

Hg-commit: 47c8b4a60f80bebc0a1c75ecd

Prepare for Rosenbrock-W schemes

TSROSW is a copy of TSARKIMEX that Emil will be modifying to implement Rosenbrock-W schemes.
Enable by configuring --with-rosw.

Hg-commit: 47c8b4a60f80bebc0a1c75ecdb39eb88772b90ce

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