added test for .ctor setion, fixed issue #101
Merge pull request #109 from YaroslavLitvinov/issue101

added test for .ctor section, fixed issue #101
issue #55 fixed -added handling of updated nvram file at zfork; docs, test-suite & test updated
Merge pull request #110 from YaroslavLitvinov/new_issue55_

issue #55 fixed - added handling of updated nvram file at zfork; docs, test-suite & test updated
o_trunc not supported, in according to https://github.com/zerovm/zerovm/issues/267
Merge pull request #112 from YaroslavLitvinov/tar_write

o_trunc not supported
fixed issue #57, test fixed
test coverage generator added; need to recompile toolchain
always add debug info
Merge pull request #113 from YaroslavLitvinov/lazymount-fix

Lazymount fix
check lcov existing in makefile clean rule
Merge pull request #117 from YaroslavLitvinov/lcov-fix

check lcov exists in makefile clean rule,
nvram removable behavior changed, tests, docs updated
Merge pull request #118 from YaroslavLitvinov/nvram-fix

nvram removable behavior changed, tests, docs updated