Some minor bugs and missing files.

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Download ratslam-read-only (R21)
2. mkdir build && cd build/ && cmake .. && make
3.

What is the expected output? What do you see instead?
Compilation of ratslam; instead, some errors.

What version of the product are you using? On what operating system?
R21, Ubuntu 12.04 LTS 64-bit

Please provide any additional information below.
I have found that in the file 'examples/opencv/main.cpp' on lines 43, 71, 82 
the namespace 'std' was not added before 'cin'. 

Additionally, a linker error came up with an undefined reference to 
boost::gregorian::greg_month::as_short_string() const and ...::as_long_string() 
const. This might be due to Boost library and I'll look into it myself first.

Then, while browsing the files, I discovered some missing or mislinked files: 
1. In src/main.cpp, lines 26-29 link to headers in the src/cpp folder, which in 
fact can be found in the src/ratslam folder.
On line 30, a link to "draw/draw.h" was created, for which the file nor folder 
can be found.
On line 32 and 33, headers from the gri folder are linked; the file 
src/gri/gri.h was not included in the download and can neither be found on the 
google code repository.
On line 34-35 the folder ir_behaviours is linked; this folder was also not 
included.
On line 57 the folder geometry_msgs is linked; this folder was also not 
included.

I must go through some more files, but I wanted to point out at least these 
issues.

Original issue reported on code.google.com by [email protected] on 10 Oct 2012 at 8:02