[ptx] Couple of bugs could be not specific to Mac

[Ippei UKAI]

I have a couple of bugs that keep me annoyed recently. Some of them are  
reported from other HuginOSX users as well. I wonder if any of those  
are Mac specific or not.

1. Saving an empty project leads to infinite loop. Trying to save a new  
file either just after start up or New command is thus impossible.  
After adding some photos, it works fine. I tried to read some codes,  
but from the first place, I did not understand the strategy here. Why  
don't we have clear multiple document style structure like Audacity  
(good opensource app using wx) does?

2. While making a control point, pressing "Fine Tune" after placing a  
point and before the other causes a crash. (Assertion Fail)

3. Often optimize function crashes leaving following crash report from  
the system:

Exception:  EXC_BAD_ACCESS (0x0001)
Codes:      KERN_PROTECTION_FAILURE (0x0002) at 0x00000008

Thread 0 Crashed:
0   net.sourceforge.hugin.HuginOSX 	0x0006b220  
_ZN17RunOptimizerFrameC4EP8wxWindowPN2PT8PanoramaERKNS2_15PanoramaOption 
sERKSt6vectorISt3setISsSt4lessISsESaISsEESaISD_EERKS9_IjSA_IjESaIjEEb +  
0x15a8 (event.h:2167)
1   net.sourceforge.hugin.HuginOSX 	0x00068de8  
OptimizePanel::runOptimizer(std::vector<std::set<std:: 
basic_string<char, std::char_traits<char>, std::allocator<char> >,  
std::less<std::basic_string<char, std::char_traits<char>,  
std::allocator<char> > >, std::allocator<std::basic_string<char,  
std::char_traits<char>, std::allocator<char> > > >,  
std::allocator<std::set<std::basic_string<char, std::char_traits<char>,  
std::allocator<char> >, std::less<std::basic_string<char,  
std::char_traits<char>, std::allocator<char> > >,  
std::allocator<std::basic_string<char, std::char_traits<char>,  
std::allocator<char> > > > > > const&, PT::PanoramaOptions const&,  
std::set<unsigned int, std::less<unsigned int>, std::allocator<unsigned  
int> > const&) + 0x8e4 (OptimizePanel.cpp:446)
2   net.sourceforge.hugin.HuginOSX 	0x00065fe8  
OptimizePanel::OnOptimizeButton(wxCommandEvent&) + 0x3d8  
(OptimizePanel.cpp:147)

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