Split OpenAlea.Components into independent packages

[pradal]

Split the package and merge the packages as submodules

[pradal]

Remove or move:

• container
• dtk
• pandas
• starter
• secondnature

The packages that composed openalea-components are:

• stdlib
• pkg_builder
• scheduler
• image
• numpy
• pylab
• svgdraw

However, several ones are needed as a full package:

• pkg_builder
• image
• svgdraw

PkgBuilder will be replaced by PkgLTS