Change sim inputs

Change generation of set of simulation input profiles to end with all dwells with a duration of at least 1ks rather than ending at perigee exit. A minimum dwell of 1ksec is used since this is generally the smallest dwell mission planning will schedule for an observation. 

Since the current set of constraints no longer share a mutual pitch range without limitation, and given scheduling during perigee passages cannot be used to the benefit of all constraints, it no longer makes sense to use perigee exits as starting times for simulations to calculate best case capability. There is a concern that only using perigee exits to calculate best case capability would result in a bias in predicted capability for some models. Although the comparisons shown below do not suggest this is currently the case, a future change in scheduling of dwells during perigee passages or the addition of new constraints could theoretically result in such a bias.

![random_vs_perigee_all](https://f.cloud.github.com/assets/1771231/560515/0949d274-c477-11e2-817d-70ce75e077a6.png)
![random_vs_perigee_tank](https://f.cloud.github.com/assets/1771231/560516/0954e2a4-c477-11e2-9083-80b0ca276b3d.png)
![random_vs_perigee_pline](https://f.cloud.github.com/assets/1771231/560517/095b3a0a-c477-11e2-89c2-e8c26c18e475.png)
![random_vs_perigee_minus_yz](https://f.cloud.github.com/assets/1771231/560518/09575e6c-c477-11e2-9096-75e53a0176f9.png)
![random_vs_perigee_psmc](https://f.cloud.github.com/assets/1771231/560519/095ca566-c477-11e2-9bb4-27d49ee620ff.png)
![random_vs_perigee_dpa](https://f.cloud.github.com/assets/1771231/560520/098cc49e-c477-11e2-9f57-06b4a2398162.png)

The following parameters were used to generate the plots shown above:
```python
max_tephin = 144.0
max_tcylaft6 = 99.0
max_1pdeaat = 52.5
max_1dpamzt = 31.5
max_pftank2t = 93.0
n_ccd = 6
max_dwell_ksec = 400
n_sim = 5000 
```
Predictions were generated for perihelion and aphelion for 2013.

All tests produced expected results.