api, mix, shiny-ui-base: Introduce the concept of "project" and "data"directories for script-based workflow.

conf gets "serial" boolean

* shiny-ui-base(celledit_values): Updated. Added new argument addna
which controls if the default "NA" value is listed, or not. Seems to
fix summ_subset. Now I wonder if initial value should be thrown out of
all the other lists.

summ_subset control is now used only during report generation in GUI.

* api(report): Updated.

* shiny-ui-base(sortsubset_b): Removed observer, because we want
defaults.

(presc_b): Updated observer. Does sorting and subsetting, now when
they are predefined.

(make_report_b): Add new observer. Creates a report.

* app(sortsubset_b): Remove control.

(make_report_b): Add control.

* api.R(report): Updated.

* plotting.R(plot_fname_prefix,plot_save_single): Updated.

* resources.R(REP_TOPDIR): New constant.

* inst/rmd/report_chunk.rmd: New template.

* inst/rmd/report_header.rmd: New template.

* man: Update docs.

* shiny-ui-base(styled_dt): Updated.

<various DT outputs>: Adapted to the updated `styled_dt`.

Values and units have not been read in the GUI template correctly. Now
fixed.

* app<numeric/unit inputs>: Updated. Read in values/units properly.

* base(get_val_unit): New exported function.

* shiny-ui-base<everything related to order_summ table>: Commented
out. Too unstable for now.

* shiny-ui-base(summ_subset-edit): Update observer.
(rf_get_subset): Update reactive function.

* app(summ_subset): Update control to DT from rhandsontable.

* shiny-ui-base (celledit_values, dt_drop_callback, editcell_script,
dropdown_dt): New functions.

(simple_style_dt): Updated.

(rf_get_inp_datafiles): Removed.

(datatab-edit): New observer.

<other observers>: Modified so they work with rv_dfiles, rv_datafiles
and dropdowns.

<renderDT>: Output renders updated.

www: cellEdit javascript and css

app: Updated controls.

shiny-ui-base.R(render_dt,simple_style_dt): New functions.

(update_gui): Updated.

(rf_get_inp_datafiles): Removed.

(datafiles-edit): New observer.

(datafiles_b, mzml_from_inp): Update observers.

(output$datafiles): Updated.

app.Rmd(datafiles): Updated output.

app: New dfile_list control

shiny-ui-base(dfile_list): New observer.
(datafiles_b): Updated.

* app (comp_list,set_list): New widgets.

* shiny-ui-base(comp_list_b,set_list_b): New observers.

(setid_b): Removed observer.