paneltests 1.0.6

Corrected the DOIs of Galvao, Juhl, Montes-Rojas and Olmo (2017) (10.1093/jjfinec/nbx016), Little (1988) (10.1080/01621459.1988.10478722) and Swamy (1970) (10.2307/1913012).
Demetrescu, Hosseinkouchack and Rodrigues (2023): title corrected to the published working-paper title and DOI corrected to 10.4419/96973210 (Ruhr Economic Papers 1041); the journal DOI previously given in DESCRIPTION pointed to an unrelated article and was removed.
No changes to code.

paneltests 1.0.5

Resubmission addressing CRAN reviewer (Benjamin Altmann) feedback on 1.0.4:
- Added DOI / ISBN links to all references in the Description field (Hsiao 2014, Swamy 1970, Pesaran 2004).
- Removed the surrounding single quotes around function names in the Description text and added trailing parentheses, e.g. 'xtpretest'-> xtpretest().
Synchronised CITATION version with DESCRIPTION (1.0.5).
No code or behavior changes.

Resubmission to CRAN.
Removed UTF-8 BOM (Byte Order Mark) from inst/CITATION and from R/xtcsdq.R, R/xtmispanel.R, R/xtqsh.R. The BOM in inst/CITATIONwas causing the CRAN incoming auto-check to fail with: Invalid citation information in 'inst/CITATION': 1:1: unexpected input.
Synchronised the version string in inst/CITATION with DESCRIPTION.
No code or behavior changes.

Resubmission. Removed redundant “a suite of tools for” from the Description start. All references use doi:10.xxx format.

Initial CRAN release.
Consolidates four previously separate packages (xtpretest, xtmispanel, xtcsdq, xtqsh) into a single panel-data pre-testing suite.
Implements:
- Hsiao (2014) homogeneity F-tests (F1/F2/F3),
- Swamy (1970) parameter heterogeneity test,
- Pesaran (2004) cross-sectional dependence test (xtpretest),
- Missing-data detection, mechanism testing, and imputation for unbalanced panels (xtmispanel),
- Demetrescu, Hosseinkouchack and Rodrigues (2023) quantile-regression cross-sectional dependence tests (xtcsdq),
- Galvao, Juhl, Montes-Rojas and Olmo (2017) panel quantile-regression slope homogeneity statistics (xtqsh).