Changes to be committed:
new file: _release/dspl.c
new file: _release/dspl.h
modified: dspl/dox/en/mainpage.dox
modified: dspl/dox/ru/mainpage.dox
modified: dspl/src/psd.c
modified: dspl/src/randgen.c
new file: examples/src/psd_bartlett_cmplx_test.c
new file: examples/src/psd_bartlett_test.c
new file: examples/src/psd_periodogram_cmplx_test.c
new file: examples/src/psd_periodogram_test.c
modified: include/dspl.c
modified: include/dspl.h